Improvement in platform-scales



2 Sheets-Sheet 1.

S. H. HIBBARD. PLATFORM-SCALES.

No 193,762. Patented July 31,1877

N.F'ETERS, FHOTO-LITHOGRAFNER, WASHXNGTOH, a c.

v zsheets Sheetz. S. H. HIBBARD. PLATFORM-SCALES.

No. 193,762. Patented July 31,1877.

'ai -i NPETERS, FHQTO-LITHOGRAPHER. WASHINGTON. D C

UNITED- STATES PATENT QFFICE.

SILAS H. HIBBARD, OF LA. SALLE, ASSIGNOR' OF TWO-THIRDS HIS RIGHT TO GH-ARLES-BRUNNER AND NORMAN SNOW, OF PERU, ILLINOIS.

IMPROVEMENT'IN PLATFORM-SCALES.

Specification forming part of Letters Patent No. [93,762, dated July 31, 1877 application filed February 7, 1877.

To all 'zohomit may co'ncewz Beitknown that I, SILAS H. HIBBARD,-Of La Salle,-in the county of La Salle, in the State of Illinois, have invented an Improvement in Wagon or Platform scales; and do hereby-declare thatthe following is a full, clear, and exact description-thereof, reference being bad to the annexedvdrawings, making a part of this specification, in which like letters of reference refer to like-parts, and in which- Figure 1' represents a plan with the steel yard and platform-removed; Fig. 2, section on line a,-:Fig. 1 5 Fig.3, vertical section on line b, Figrcl; Fig.-v 4, vertical section on line 0, Fig.1 1; Fig.-5,--vertical section on line (1, Fig.1; Fig.6, a cross-section on-f, Fig. 1; Fig'fl, a vertical section online 2', Fig.2; Fig. 8, a side-elevation of pivot housing and shackles;- Fig-.9, cross-section of housing-with shackle; Fig. 10,'elevationof pivot-housing A Fig. 11, cross-section-of steelyard online h, Fig.2; and Fig. 12,-elevation of end of platform beam and bearin g on lever.

The objects of this invention are- First to obtain a very sensitive scale.

Second, to avoid the usual pitahd foundations.

Third, to obtain a portable scale;

Fourth,-to deaden or destroy the oscillation of the platform, so that the latter on receiving weight, will not have the efl'ect to destroy the sensitiveness of thepivots or housings an d levers by throwing the latter out-of perpen-- dicularity.

Fifth, to weigh various kinds ofgrain-inbushels, ingrossor net weight, by-means of changeable: scales or indices.

The first object is accomplished by connect:

and frame and disconnection with any pit or foundation, so that the whole can be transported on friction-rollers or small wheels in the base of the-frame.

Thefourth object is accomplished by placing an elastic or spring foundation between the housings and their foundation-beams, which brace the frame.

The fifth object is attained by forking the. stcelyard into two parallel arms, to receive various differently-graded scales or indices, so that, as before said, various kinds of. grain or produce, &c., can be weighed in gross or in' net.

This scale is inclosed in a frame which receives the platform, and within each end, at right angles with the steelyard side, is a 0IOS5- beam, upon which rest the respective pivothousings, three to each beam. There are four bearing-levers, placed in pairs on either of said beams, the longest lever of each pair bcing connected with one of the two steelyardlevers on thethird side of said frame, and extend outward the whole width of the scales to their respective housings or pivots, each pass ing through or by an intermediate pivothousing, which is the pivot of its companion lever just above it, and which lever is aboutonethird shorter, and covers (or is placed over) the central part of said longer lever. The free end of the shorter lever rests in a stirrup on the upper edge of the longer one, forwhich purpose, and to bring these pairs of levers on a line or level, the longer lever is recessed or bent in profile. There are no levers or ma chinery on the: fourth or outer side of the scales, opposite to the-steelyard. The hearing parts of'each of these pairs of levers are,

of course, just inside of each-fulcrumor pivot, four-bearingsin all, (i. 8., platform-bearings,) and the longer levers deliver the weight to the steelyard-levers, the two being connected by means of stirrups. The=pivot-housings of the main pairs-of levers are fixed to their respective beams, each having an elastic substance or springs placed between them and their beams to allow the housings to sway slightly to keep the pivots on a .true hearing, so preventing the platform from deranging the efficient working of the scales. Each pivot-housing of said main levers consists of a base-plate,

from which rise short uprights united by a cross-piece, from which, or the uprights, swing the pivot eyes or shackles. The pivot-hone ings, at the junction of the main or platformbearing levers with the steelyard-levers, have, in like manner, a swinging pivot-eye for the pivot of the respective steelyard-levers. One of the uprights in this case is dispensed with, as in the way. The steelyard-levers are on or near the same level with the main levers, and their free ends meet in the stirrup of the vertical steelyard-rod. The steelyard forks into two parallel horizontal arms, each arm being fitted to receive any of a series of movable and graduated scales or divisional bars or rods, indicatingpounds or other measures of weight, bushels, &c.

I construct this scale as follows: P represents the inolosing-frame; N N, the attached cross-beams below, which carry the pivothousings; A A A A the pivot-housings, set upon rubbers c c, and bolted to their respective beams, but so as to allow a little play, or lateral sway, to allow the housings to keep the pivots of their respective levers D E in a true or continuous bearing, whatever the agitation made by a vehicle may be, as well as to break the vertical jar on the scales by such vehicle.

Within the housings are hooks or supports, on either side, from which swing the pivot eyes or shackles B B, supporting either end of a lever-pivot or knife-edge, a. The housings A at the junction of the main with the steelyard levers F, have but one upright, and the pivot has but one eye or shackle, b.

D represents the longer bearing-levers, one at either end of the frame P, each pivoted in their respective shackles B and housing A at the end farthest from the steelyard G. Each lever D D is recessed in profile at about twothirds of its length from said housing, to make room for the companion short lever E above it, and for the attaching-stirrup c, of a parallelogram form, and each rest their free ends in their respective stirrups e e, pendent from the pivoted end of each steelyard-lever F F. The latter at their free ends rest in the respective stirrups K K of the steelyardrod S, so preserving the perpendicularity of said rod S.

The points of each lever D are made extensible, if necessary, in arranging or adjusting the scale, by being each provided with a short sliding extension point, it, provided with a set-screw, to extend it more or less within stirrup e.

G represents the steelyard, provided with a double or divided arm, L L, for weighing, each arm being provided with removable adjustable weight-indicating scales Z I, each graduated for any known weight or measure.

These scales consist of two plates joined at right angles, and notched at their ends, and made to fit over the arms of the steelyard G, and secured thereon by the pins m m and n a passing through the notched ends of the plates and the ends of the arms. Thus by slipping out the pins the scales can be removed, and others of a different graduated measure substituted in their places.

0 0 represent the platform-beams, to which the boards or flooring of the platform are fixed. These rest at either end upon one of the ribs f, near the respective fulcra of the levers D E, and between each rib f and the beam is placed, first, a steel plate, I, recessed to admit said rib; second, between said plate I and the beam is interposed the rubber plate J; and, third, between the rubber and the beam is bolted the heel-iron H, which is bolted to the beam, and braced to its fellow at the other end of the same beam by means of a brace-rod, M. This platform is steadied by means of chains i 1 i 2', in the usual mode.

The longer levers D D have extensible points t, with screws and slots, by which the levers are more nicely adjusted to the connecting or adjoining levers.

What I claim as my invention is- 1. The long levers D D, constructed to allow the short levers E E to extend over and connect in the same plane with levers D 'D by means of the stirrups e e, the said levers D D and E E having their bearings in pivot-housings attached to the beams of the frame-work, in combination with the steelyard-levers F F, substantially as and for the purposes set forth.

2. The pivot-housings, having rubber plates or springs a interposed between them and the beams upon which they are attached, substantially as and for the purpose set forth.

3. The interposition of rubber plates or springs between the bearing-plates I and the iron heels or plates H on the ends of the beams of a platform-scale, substantially as and for the purpose set forth.

4. The platform-beams, having a rubber plate, J, interposed between the recessed bearing-plates I and iron heels H, attached to the ends of the said beams, and secured by bracerods M, substantially as described.

5. The plates forming the removable scales, as described and shown, and having their ends notched and made to fit over the arms of the steelyard G, in combination with the removable pins m m and n 11,, substantially as set forth.

In testimony that I claim the foregoing wagon or platform scale I have hereunto set my hand this 1st day of January, A. D. 1877.

SILAS H. HIBBARD.

Witnesses:

' HAMILTON M. GALLAGHER,

H. W. UNDERHILL. 

